Siemens 5TT5741-0 SENTRON Insta Contactor, 40 A, 230 V AC

The Siemens 5TT5741-0 is a SENTRON Insta contactor with a 3 NO + 1 NC contact arrangement, rated for 40 A at 230 V AC operating voltage. The coil accepts both AC and DC actuation — 230 V AC or 220 V DC — so it can be driven from a standard control transformer or a 220 V DC battery-backed supply without an intermediate relay, provided that the coil dropout characteristic matches the protection logic's undervoltage release scheme. The 40 A AC-rated current makes it suitable for switching resistive and moderate inductive loads — heating elements, lighting banks, or small motor loads — within the thermal limits of a 3-module-wide DIN-rail footprint. The 64 mm installation depth and 71 mm overall depth fit standard 80 mm deep enclosures, leaving clearance for wiring behind the DIN rail.